Quantification of the shear stresses in a microbial granular sludge reactor.
Quantification of the shear stresses in a microbial granular sludge reactor.
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DOI：
10.1016/j.watres.2009.07.019
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发表时间：
2009-10
期刊：
影响因子：
12.8
通讯作者：
Ting-ting Ren;Y. Mu;Li Liu;Xiao-yan Li;Hanqing Yu
中科院分区：
文献类型：
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作者：
Ting-ting Ren;Y. Mu;Li Liu;Xiao-yan Li;Hanqing Yu
由于废水处理中微生物颗粒的形成需要一定水平的水动力剪切力，因此迫切需要一种量化微生物颗粒污泥反应器中剪切应力的方法。在这项工作中，建立了一个新的基于能量耗散的模型，并对其进行了验证，以定量描述颗粒污泥序批式反应器（SBR）中的剪切应力。利用该模型估计了SBR中固液界面处的剪切应力，并对流体、气泡和颗粒碰撞引起的剪切应力的相对大小进行了评估。结果表明，反应器的几何形状对整体剪切应力的影响是显著的。随着SBR中生物量浓度的增加，微生物颗粒表面剪切应力和生物量损失率均增加。气泡和碰撞是颗粒表面剪切应力的主要来源。
Since a certain level of hydrodynamic shear force is needed in the formation of microbial granules for wastewater treatment, a method for quantifying the shear stresses in a microbial granular sludge reactor is highly desirable. In this work a novel energy-dissipation-based model was established and validated to quantitatively describe the shear stresses in a granular sludge sequencing batch reactor (SBR). With this model, the shear stress at the solid–liquid interface in an SBR was estimated and the relative magnitudes of shear stresses induced by fluid, gas bubble and collision on granules were evaluated. The results demonstrate that the effect of reactor geometry on the global shear stress was significant. Both the shear stress at the microbial granule surface and the biomass-loss rate increased with an increase in biomass concentration in the SBR. The gas bubble and the collision were found to be the main source for the shear stress at the granule surface.